Add extra vendor stuff.

vendor/github.com/fatih/color/.travis.yml

vendor/github.com/fatih/color/Gopkg.lock

vendor/github.com/fatih/color/Gopkg.toml

vendor/github.com/fatih/color/LICENSE.md

vendor/github.com/fatih/color/README.md

vendor/github.com/fatih/color/color.go

vendor/github.com/fatih/color/doc.go

vendor/github.com/mattn/go-colorable/.travis.yml

vendor/github.com/mattn/go-colorable/LICENSE

vendor/github.com/mattn/go-colorable/README.md

vendor/github.com/mattn/go-colorable/colorable_appengine.go

vendor/github.com/mattn/go-colorable/colorable_others.go

vendor/github.com/mattn/go-colorable/colorable_windows.go

vendor/github.com/mattn/go-colorable/noncolorable.go

vendor/github.com/mattn/go-isatty/.travis.yml

vendor/github.com/mattn/go-isatty/LICENSE

vendor/github.com/mattn/go-isatty/README.md

vendor/github.com/mattn/go-isatty/doc.go

vendor/github.com/mattn/go-isatty/isatty_appengine.go

vendor/github.com/mattn/go-isatty/isatty_bsd.go